Answer:
The sample standard deviation is of 248.19.
Explanation:
First we find the sample mean, which is needed to find the sample standard deviation.
Sample mean:
Sum of all values in the sample, divided by the number of values. So

Sample standard deviation:
Square root of the sum of the difference squared between each value and the mean, divided by the number of values. So:

The sample standard deviation is of 248.19.